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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Security server interface.
4 *
5 * Author : Stephen Smalley, <sds@tycho.nsa.gov>
6 *
7 */
8
9#ifndef _SELINUX_SECURITY_H_
10#define _SELINUX_SECURITY_H_
11
12#include <linux/compiler.h>
13#include <linux/dcache.h>
14#include <linux/magic.h>
15#include <linux/types.h>
16#include <linux/refcount.h>
17#include <linux/workqueue.h>
18#include "flask.h"
19
20#define SECSID_NULL 0x00000000 /* unspecified SID */
21#define SECSID_WILD 0xffffffff /* wildcard SID */
22#define SECCLASS_NULL 0x0000 /* no class */
23
24/* Identify specific policy version changes */
25#define POLICYDB_VERSION_BASE 15
26#define POLICYDB_VERSION_BOOL 16
27#define POLICYDB_VERSION_IPV6 17
28#define POLICYDB_VERSION_NLCLASS 18
29#define POLICYDB_VERSION_VALIDATETRANS 19
30#define POLICYDB_VERSION_MLS 19
31#define POLICYDB_VERSION_AVTAB 20
32#define POLICYDB_VERSION_RANGETRANS 21
33#define POLICYDB_VERSION_POLCAP 22
34#define POLICYDB_VERSION_PERMISSIVE 23
35#define POLICYDB_VERSION_BOUNDARY 24
36#define POLICYDB_VERSION_FILENAME_TRANS 25
37#define POLICYDB_VERSION_ROLETRANS 26
38#define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27
39#define POLICYDB_VERSION_DEFAULT_TYPE 28
40#define POLICYDB_VERSION_CONSTRAINT_NAMES 29
41#define POLICYDB_VERSION_XPERMS_IOCTL 30
42#define POLICYDB_VERSION_INFINIBAND 31
43#define POLICYDB_VERSION_GLBLUB 32
44
45/* Range of policy versions we understand*/
46#define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
47#define POLICYDB_VERSION_MAX POLICYDB_VERSION_GLBLUB
48
49/* Mask for just the mount related flags */
50#define SE_MNTMASK 0x0f
51/* Super block security struct flags for mount options */
52/* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
53#define CONTEXT_MNT 0x01
54#define FSCONTEXT_MNT 0x02
55#define ROOTCONTEXT_MNT 0x04
56#define DEFCONTEXT_MNT 0x08
57#define SBLABEL_MNT 0x10
58/* Non-mount related flags */
59#define SE_SBINITIALIZED 0x0100
60#define SE_SBPROC 0x0200
61#define SE_SBGENFS 0x0400
62#define SE_SBGENFS_XATTR 0x0800
63
64#define CONTEXT_STR "context"
65#define FSCONTEXT_STR "fscontext"
66#define ROOTCONTEXT_STR "rootcontext"
67#define DEFCONTEXT_STR "defcontext"
68#define SECLABEL_STR "seclabel"
69
70struct netlbl_lsm_secattr;
71
72extern int selinux_enabled_boot;
73
74/* Policy capabilities */
75enum {
76 POLICYDB_CAPABILITY_NETPEER,
77 POLICYDB_CAPABILITY_OPENPERM,
78 POLICYDB_CAPABILITY_EXTSOCKCLASS,
79 POLICYDB_CAPABILITY_ALWAYSNETWORK,
80 POLICYDB_CAPABILITY_CGROUPSECLABEL,
81 POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION,
82 __POLICYDB_CAPABILITY_MAX
83};
84#define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
85
86extern const char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX];
87
88/*
89 * type_datum properties
90 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
91 */
92#define TYPEDATUM_PROPERTY_PRIMARY 0x0001
93#define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
94
95/* limitation of boundary depth */
96#define POLICYDB_BOUNDS_MAXDEPTH 4
97
98struct selinux_avc;
99struct selinux_ss;
100
101struct selinux_state {
102#ifdef CONFIG_SECURITY_SELINUX_DISABLE
103 bool disabled;
104#endif
105#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
106 bool enforcing;
107#endif
108 bool checkreqprot;
109 bool initialized;
110 bool policycap[__POLICYDB_CAPABILITY_MAX];
111 struct selinux_avc *avc;
112 struct selinux_ss *ss;
113} __randomize_layout;
114
115void selinux_ss_init(struct selinux_ss **ss);
116void selinux_avc_init(struct selinux_avc **avc);
117
118extern struct selinux_state selinux_state;
119
120static inline bool selinux_initialized(const struct selinux_state *state)
121{
122 /* do a synchronized load to avoid race conditions */
123 return smp_load_acquire(&state->initialized);
124}
125
126static inline void selinux_mark_initialized(struct selinux_state *state)
127{
128 /* do a synchronized write to avoid race conditions */
129 smp_store_release(&state->initialized, true);
130}
131
132#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
133static inline bool enforcing_enabled(struct selinux_state *state)
134{
135 return READ_ONCE(state->enforcing);
136}
137
138static inline void enforcing_set(struct selinux_state *state, bool value)
139{
140 WRITE_ONCE(state->enforcing, value);
141}
142#else
143static inline bool enforcing_enabled(struct selinux_state *state)
144{
145 return true;
146}
147
148static inline void enforcing_set(struct selinux_state *state, bool value)
149{
150}
151#endif
152
153#ifdef CONFIG_SECURITY_SELINUX_DISABLE
154static inline bool selinux_disabled(struct selinux_state *state)
155{
156 return READ_ONCE(state->disabled);
157}
158
159static inline void selinux_mark_disabled(struct selinux_state *state)
160{
161 WRITE_ONCE(state->disabled, true);
162}
163#else
164static inline bool selinux_disabled(struct selinux_state *state)
165{
166 return false;
167}
168#endif
169
170static inline bool selinux_policycap_netpeer(void)
171{
172 struct selinux_state *state = &selinux_state;
173
174 return state->policycap[POLICYDB_CAPABILITY_NETPEER];
175}
176
177static inline bool selinux_policycap_openperm(void)
178{
179 struct selinux_state *state = &selinux_state;
180
181 return state->policycap[POLICYDB_CAPABILITY_OPENPERM];
182}
183
184static inline bool selinux_policycap_extsockclass(void)
185{
186 struct selinux_state *state = &selinux_state;
187
188 return state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS];
189}
190
191static inline bool selinux_policycap_alwaysnetwork(void)
192{
193 struct selinux_state *state = &selinux_state;
194
195 return state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK];
196}
197
198static inline bool selinux_policycap_cgroupseclabel(void)
199{
200 struct selinux_state *state = &selinux_state;
201
202 return state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL];
203}
204
205static inline bool selinux_policycap_nnp_nosuid_transition(void)
206{
207 struct selinux_state *state = &selinux_state;
208
209 return state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION];
210}
211
212int security_mls_enabled(struct selinux_state *state);
213int security_load_policy(struct selinux_state *state,
214 void *data, size_t len);
215int security_read_policy(struct selinux_state *state,
216 void **data, size_t *len);
217size_t security_policydb_len(struct selinux_state *state);
218
219int security_policycap_supported(struct selinux_state *state,
220 unsigned int req_cap);
221
222#define SEL_VEC_MAX 32
223struct av_decision {
224 u32 allowed;
225 u32 auditallow;
226 u32 auditdeny;
227 u32 seqno;
228 u32 flags;
229};
230
231#define XPERMS_ALLOWED 1
232#define XPERMS_AUDITALLOW 2
233#define XPERMS_DONTAUDIT 4
234
235#define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
236#define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
237struct extended_perms_data {
238 u32 p[8];
239};
240
241struct extended_perms_decision {
242 u8 used;
243 u8 driver;
244 struct extended_perms_data *allowed;
245 struct extended_perms_data *auditallow;
246 struct extended_perms_data *dontaudit;
247};
248
249struct extended_perms {
250 u16 len; /* length associated decision chain */
251 struct extended_perms_data drivers; /* flag drivers that are used */
252};
253
254/* definitions of av_decision.flags */
255#define AVD_FLAGS_PERMISSIVE 0x0001
256
257void security_compute_av(struct selinux_state *state,
258 u32 ssid, u32 tsid,
259 u16 tclass, struct av_decision *avd,
260 struct extended_perms *xperms);
261
262void security_compute_xperms_decision(struct selinux_state *state,
263 u32 ssid, u32 tsid, u16 tclass,
264 u8 driver,
265 struct extended_perms_decision *xpermd);
266
267void security_compute_av_user(struct selinux_state *state,
268 u32 ssid, u32 tsid,
269 u16 tclass, struct av_decision *avd);
270
271int security_transition_sid(struct selinux_state *state,
272 u32 ssid, u32 tsid, u16 tclass,
273 const struct qstr *qstr, u32 *out_sid);
274
275int security_transition_sid_user(struct selinux_state *state,
276 u32 ssid, u32 tsid, u16 tclass,
277 const char *objname, u32 *out_sid);
278
279int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
280 u16 tclass, u32 *out_sid);
281
282int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
283 u16 tclass, u32 *out_sid);
284
285int security_sid_to_context(struct selinux_state *state, u32 sid,
286 char **scontext, u32 *scontext_len);
287
288int security_sid_to_context_force(struct selinux_state *state,
289 u32 sid, char **scontext, u32 *scontext_len);
290
291int security_sid_to_context_inval(struct selinux_state *state,
292 u32 sid, char **scontext, u32 *scontext_len);
293
294int security_context_to_sid(struct selinux_state *state,
295 const char *scontext, u32 scontext_len,
296 u32 *out_sid, gfp_t gfp);
297
298int security_context_str_to_sid(struct selinux_state *state,
299 const char *scontext, u32 *out_sid, gfp_t gfp);
300
301int security_context_to_sid_default(struct selinux_state *state,
302 const char *scontext, u32 scontext_len,
303 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
304
305int security_context_to_sid_force(struct selinux_state *state,
306 const char *scontext, u32 scontext_len,
307 u32 *sid);
308
309int security_get_user_sids(struct selinux_state *state,
310 u32 callsid, char *username,
311 u32 **sids, u32 *nel);
312
313int security_port_sid(struct selinux_state *state,
314 u8 protocol, u16 port, u32 *out_sid);
315
316int security_ib_pkey_sid(struct selinux_state *state,
317 u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
318
319int security_ib_endport_sid(struct selinux_state *state,
320 const char *dev_name, u8 port_num, u32 *out_sid);
321
322int security_netif_sid(struct selinux_state *state,
323 char *name, u32 *if_sid);
324
325int security_node_sid(struct selinux_state *state,
326 u16 domain, void *addr, u32 addrlen,
327 u32 *out_sid);
328
329int security_validate_transition(struct selinux_state *state,
330 u32 oldsid, u32 newsid, u32 tasksid,
331 u16 tclass);
332
333int security_validate_transition_user(struct selinux_state *state,
334 u32 oldsid, u32 newsid, u32 tasksid,
335 u16 tclass);
336
337int security_bounded_transition(struct selinux_state *state,
338 u32 oldsid, u32 newsid);
339
340int security_sid_mls_copy(struct selinux_state *state,
341 u32 sid, u32 mls_sid, u32 *new_sid);
342
343int security_net_peersid_resolve(struct selinux_state *state,
344 u32 nlbl_sid, u32 nlbl_type,
345 u32 xfrm_sid,
346 u32 *peer_sid);
347
348int security_get_classes(struct selinux_state *state,
349 char ***classes, int *nclasses);
350int security_get_permissions(struct selinux_state *state,
351 char *class, char ***perms, int *nperms);
352int security_get_reject_unknown(struct selinux_state *state);
353int security_get_allow_unknown(struct selinux_state *state);
354
355#define SECURITY_FS_USE_XATTR 1 /* use xattr */
356#define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
357#define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
358#define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
359#define SECURITY_FS_USE_NONE 5 /* no labeling support */
360#define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
361#define SECURITY_FS_USE_NATIVE 7 /* use native label support */
362#define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
363
364int security_fs_use(struct selinux_state *state, struct super_block *sb);
365
366int security_genfs_sid(struct selinux_state *state,
367 const char *fstype, char *name, u16 sclass,
368 u32 *sid);
369
370#ifdef CONFIG_NETLABEL
371int security_netlbl_secattr_to_sid(struct selinux_state *state,
372 struct netlbl_lsm_secattr *secattr,
373 u32 *sid);
374
375int security_netlbl_sid_to_secattr(struct selinux_state *state,
376 u32 sid,
377 struct netlbl_lsm_secattr *secattr);
378#else
379static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
380 struct netlbl_lsm_secattr *secattr,
381 u32 *sid)
382{
383 return -EIDRM;
384}
385
386static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
387 u32 sid,
388 struct netlbl_lsm_secattr *secattr)
389{
390 return -ENOENT;
391}
392#endif /* CONFIG_NETLABEL */
393
394const char *security_get_initial_sid_context(u32 sid);
395
396/*
397 * status notifier using mmap interface
398 */
399extern struct page *selinux_kernel_status_page(struct selinux_state *state);
400
401#define SELINUX_KERNEL_STATUS_VERSION 1
402struct selinux_kernel_status {
403 u32 version; /* version number of thie structure */
404 u32 sequence; /* sequence number of seqlock logic */
405 u32 enforcing; /* current setting of enforcing mode */
406 u32 policyload; /* times of policy reloaded */
407 u32 deny_unknown; /* current setting of deny_unknown */
408 /*
409 * The version > 0 supports above members.
410 */
411} __packed;
412
413extern void selinux_status_update_setenforce(struct selinux_state *state,
414 int enforcing);
415extern void selinux_status_update_policyload(struct selinux_state *state,
416 int seqno);
417extern void selinux_complete_init(void);
418extern int selinux_disable(struct selinux_state *state);
419extern void exit_sel_fs(void);
420extern struct path selinux_null;
421extern struct vfsmount *selinuxfs_mount;
422extern void selnl_notify_setenforce(int val);
423extern void selnl_notify_policyload(u32 seqno);
424extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
425
426extern void avtab_cache_init(void);
427extern void ebitmap_cache_init(void);
428extern void hashtab_cache_init(void);
429extern int security_sidtab_hash_stats(struct selinux_state *state, char *page);
430
431#endif /* _SELINUX_SECURITY_H_ */